Coating or covering vulcanized plates with metal.



No. 652,751. rammed: July 3, I900.

J. A. DALY.

COATING 0R COVERING VULGA NIZED PLATES WITH METAL. (Appliczitinn filedAug. 8, 1899.)

(No Model.)

fileclro-clepou'f-mel'al. I Mlllz'c eier.

Vulcanized.

1M. (Swot/w I I m: Momus PETERS co., mom-Limo" wnsumcmu. 11c.

UNITED STATES PATENT OFFICE.

JOHN A. DALY, OF \VASHINGTON, DISTRICT OF COLUMBIA;

fioATlNc oR COVERING VULC'ANIZED PLATES WITH METAL.

SPECIFICATION forming part 6% Letters Patent no. 652,751, dated July a,1906.

Application filed August 8, 1899. fierial No, 726,568. (No specimens.)

T0 all whom, it may con/00741,:

Be it known that I, JOHN A. DALY, a citizen of the United States,residing at Washington, District of Columbia, have invented certain newand useful Improvements in Coatin g or Ooverin g Vulcanized Plates withMetal, of which the following is a specification, reference bei n g hadtherein to the accompanying drawing.

- This invention relates to the covering or lining of vulcanized dentalor similar plates with a metal coating.

In my Patent No. 390,950, dated October 9, 1888, I describe a metallicfoil (gold-foil) having one spongy face, with one bright or burnishedface. In my Patent No. 390,654 of the same date I describe a method ofattaching such foil to a dental plate.

lic lining other than foil and is especially intended for dental plates,although applicable to other vulcanized plates.

The drawing illustrates the general arrange ment of the plate,interposed metallic substance, and electrodeposited lining.

I take a vulcanized dental plate of the usual vulcanized rubber compoundor of celluloid, Xylonite, or thelike, preferably when the same iscomplete as made by us'ual processes and ready for use. The surfacewhich is to be covered with metal I roughen or scratch and then apply athin coating of celluloid, collodion, or xylonite varnish, which isgenerally a solution of celluloid in a solvent, such as camphor, ether,or alcohol. While the Xylonite or other varnish is sticky, I cover thesame with a powder of comminuted metalsuch as brass or tin filings orpowder or fine bits or scraps of nickel, silver, or other metalor ametallic foil having a rough or spongy face might be applied to thesticky varnish. When the varnished surface is well covered with metallicdust or the like, the plate may be heated, when the celluloid willbecome dry and hard, firmly attaching themetallic powder thereto. Whendry or partly dry, the dusted, metalized, or bronzed surface can beburnished down with a tool and the metal will present a burnishedsurface having almost the appearance of foil. This metallic My presentink vention applies to the production of a metal surface may beincreased in thickness by the electrodeposition of a metal, which metalshould preferably be gold.

Instead of applying a base-metal powder to the plate the plate may becovered in such parts as need covering with a tacky solution of Xyloniteand gold-dust,or irregular or rougli gold may be sifted thereon andburnished down, or the gold-dust or bronze maybe mixed with thecelluloid or Xylonite solution and painted on the vulcanized plate, andwhen dry the surface of the projecting bits of metal maybe burnisheduntil a foil or film is formed. 1 The advantage of the present processover such as'require vulcanization is in the cheapnessof the process andproduct. I do not consider theresulting plate equal to my plate, inwhich a spongy foil is vulcanized to a dental plate; but neverthelessthe present process may be used for cheaper kinds of work.

The purpose of lining any vulcanized dental plate with metal (whichmetal usually has a gold finish) is to prevent the secretions of themouth from attacking the rubber or other material of the body of theplate and producing deleterious or poisonous compounds or gases.Oelluloid'or Xylonite, especially when dissolved in spirits of camphor,produces a cement which is little subject to disintegration by thefluids of the mouth or stomach and is therefore well adapted for use asan agent for the attachment of powdered, shredded, or comminuted metalto a vulcanized plate.

The drying of the varnish or cement may be hastened by heating.

WVhat I claim is l. The method of coating a vulcanized dental or similarplate, which consists in applying'a coating of the described adhesivesolution, applying thereto a quantity of comminuted metal, and dryingthe same.

2. The method of coating a vulcanized dental or similar plate, whichconsists in applying thereto a solution of celluloid, applying irregularportions of metal thereon, and burnishing the metal to form asubstantiallysmooth metallic surface, substantially as described.

3. The method of coating a vulcanized rubber dental plate, whichconsists in coating the previously-vulcanized dental plate with acelluloid solution, covering the celluloid with metal having anirregular structure, and bur- 5 nishing the metal into the celluloid tosecure firm attachment and electrodepositing a coat of metal thereon,substantially as described.

In testimony whereof I alfix my signature in presence of two Witnesses.

JOHN A. DALY.

Vituesses:

W. A. BARTLETT, S. A. TERRY.

